Liner setter and puller



Spt. 30, 1930. a. F. BLACKMARR LINER SETTER AND FULLER Filed latch 1929Patented Sept. 3D, 1930 u UNITED ls'rA'l'lss BYRUN FQBIIAKMARR, OFBAKERSFIELD, CALIFORNIA man snr'rnn AND BULLER .Application med Marchle, 1929. Serial No. 347,866.

This invention relates to devices of the type employed, for example, asa lmer setter and adaptor or, as it is frequently termed hook-n andhook-off adaptor, as a safety joint for e fishing tools, or as a bearingpuller.

- in the art relating to the drilling of oil wells, it is generallynecessary to place a smaller string of casing inside of a larger string.For example, this is done in setting a perforated string or liner, as itis termed.

Since it is unnecessary to extend the smaller casing to the top of thewell, it is the usual practice to set the liner by lowering the sameinto position with a strin of drill pipe. A i means must be provided orreleasably coupling the drill stem to the liner so that the liner can belowered into and raised from the well. This invention is well adapted tothus releasably couple a string of casing to the drill stem in themanner mentioned. l

It is an object of the present invention to provide a device of thischaracter of comparatively simple construction and one that is reliablein its operation. A

A very important object 1s to prevent accidental disengagement of thecoupling members.

Another object is to insure that` relative rotation between the couplingmembers, while lowering the casing into or raising it from the well,will not cause the coupling members to become disengaged.

Other objects and advantages will appear in the subjoined detaileddescription.

The accompanying drawings illustrate the invention:

Fig. 1 is a longitudinal View, mainly in mid section, of a liner setterand puller constructed in accordance with the provisions of thisinvention, fragments of a drill pipe or stem and of a liner or string ofcasing being indicated in broken lines as connected with the coupling.

Fig. 2 is a horizontal section on the line indicated by 24-2, Fig. 1.

Fig. 3 is a view similar to Fig. 1, with a portion of the mandrel brokenaway, and with the parts in diii'erent positions than in 5o Fig. 1.

Fig. 4 is a horizontal section on the line indicated by 4 4 of Fig. 3.

Referring to the drawing, the linervsetter and puller comprisesa lineradaptor 6 and a mandrel 7 releasably connected with the adaptor. Theadaptor is internally threaded at its lower endat 8 so as to adapt itfor screwing' on to the upper end of a member A that is to be pulled,such, for example, as a liner.

The upper end of the mandrel 7 is provided with a threaded box 9 so asto adapt it for receiving a threaded pin B on the lower end of a stringof drill pipe, indicated at C which is employed in the operation oflowering the liner A into and raising said liner from a well. Themandrel 7 is provided with an axial bore 10 extending `from end to endthereof so as to enable mud to be circulated through said mandrel,'ifthat should be adeoI visable or necessary. 7

The mandrel is provided with an external annular shoulder 11 and theadaptor is provided with an internal annular approximately horizontalshoulder 12. The distance from the shoulder 12 to the adjacent end ofthe adaptor is less than the distance from the shoulder l1 to a dogordogs 13, which are adapted to project from the mandrel beneath theshoulder 12. Thus, when the dogs 13 are projected beneath the shoulders12, relative axial movement within prescribed limits may take placebetween the adaptor and the mandrel without disengaging the dogs fromthe mandrel, provided the mandrel and adaptor are not turned topredetermined positions rel ative to each other.

The dogs 13 are crescent shaped and are pivoted at' their adjacent endsby pins 14 to the mandrel. The dogs 13 are yieldingly held outwardly intheir latching positions by a spring 15 which is accommodated in aspring chamber 16 that extends transversally through the mandrel,` theopposite ends of said spring engaging the inner faces of the dogs 13.

The dogs 13 are partly accommodated at all times and are adapted to bewholly retracted within a circumferentially extending groove or recess17in the mandrel 7, said dogs being loo . in the unlatchingpositionswhen thus repositioned `midway of the length of the bore portion 18 andare thus spaced from the shoulder 12 and the lower end of the b ore 18,thus imalngitnecessary, for eiecting retraction of the dogs 13, that themandreland. adaptor be relatively positioned to bring the dogs midway ofthe bore portion 18. The projec- ,2o tions 19 terminate downwardly inoutwardly and downwardly slanting cam faces 20, which function, when themandrel is pulled upwardly, to gradually force the dogs 13 inwardly intothe recesses 17 in the mandrel, in which 2 5 `positionthe dogs areunlatched, thereby enabling the dogs to pass the projections 19 so thatthe mandrel can be withdrawn from the well. The adaptor has an upwardlyand outwardly tapered portion 21 which, when the `3 0 v mandrel islowered into the well, functions to force the dogsinwardly so as to passthis projections 19, after which the dogs 13 are ur ed outwardly hy thespring 15 so as to engage eneath theJ shoulder 12. The mandrel, ispreferably, provided in the recess 17 with oppositely positioned webs 22which join the end walls of the recess 17 for strengthening purposes,said webs being positioned between the opposing dogs 13.

' The oreg'oingwill make clear the construction and operation of theinvention and, briefly stated, the operation is as follows:

Assuming, for example, that the parts are in the positions illustratedin Fig. 1 and that the parts are being lowered into the well andassuming that the outer face of the adaptor is engagedby the wall of thehole in its descent, there may be atendency for the adaptor r to beturned by reason of its contact with the 59 wall of the hole. Theadaptor will freely turn, without any liability of the dogs 13 beingdisengaged therefrom. This will be true whether the shoulder .12 beengaged by the dogs 13 or lthe mandrel be forced downwardly in theadaptor until the dogs are positioned beneath the level vof theprojections 19, as

would occur, for example, when the liner A strikes the bottom of thewell.

l lt is preferable that the adaptor be provid- 30 ed with inwardlyprojecting vertically extending shoulders 23 below thelevel of the camfaces 20. The advantagey of this construction is that, in the operationof setting the liner, if said liner should stick fast, the

* mandrel will descend in the bore of the adaptlevel of the sh'oul ers23. he operator will then cause the drill pipe to be rotated,thusquentlycausing the ada tor to turn with the mandrel. It will be'reaily understood that the liner ma thus be readily rotated in eitherd1rection,.i itshould tend to stick, without `any liability ofaccidentally disconnecting the mandrel and adaptor.

, Now, assuming that the liner has been set in position in the well, andthat the shoulder l1 1s resting on the end of the adaptor and that it isdesired to disengagej the mandrel from the adaptor, the drill pipe, towhich the mandrel is secured, will be turned by the driller to -causethe dogs 13 to be in vertical alinement with the cam faces 20,whereuponl the driller will cause the drill pipe to be pulled upwardly,thereby causing the cam faces 2O to force the dogs 13 inwardly so asto'retract said dogs and permit them to pass the projections 19.

To hook onto the` adaptor, the driller will lower the drill pipe withthe mandrel at-y tached thereto and upon engagement of the dogs 13 withthe tapered face 21, said dogs will be retracted so as to pass the projections 19, whereupon said dogs will snap outwardly into positionbeneath the shoulder 12. The driller now causes the drill pipe to beraised, thus pulling the adaptor out of the well together with the linerA secured to said adaptor.

l claim:

1. A liner setter and puller comprising a tubular member provided withan enlarged bore portion defining a shoulder, a mandrel adapted'to enterthe bore of the tubular member, a dog movably mounted in the mandrel, ameans yieldingly holding the dog outwardly so as to engage saidshoulder, and an inward projection in the enlarged bore portion of thetubular member adapted to be brought into engagement with the dog byrelative movement between the tubular member and mandrel for retractingsaid dog.

2. A liner setterrand puller comprising a tubular member provided withan enlarged bore portion defining a shoulder, a mandrel adapted to enterthe borekof the tubular member, a dog movably mounted inthe mandrel andadapted to engage said shoulder when said mandrel is in one position, ameans to yieldingly hold the dog outwardly, and a projection in theenlarged bore portion spaced from the shoulder and from the opposite endof the enlarged bore portion and adapted to engage and retract the dogWhen the mandrel is moved to bring the dog to mid position in theenlarged bore portion.

3. A liner setter and puller comprising a tubularmember provided with anenlarged bore portion defining a shoulder, a mandrel `or 6 until the do13 are itioned at the adapted to enter the bore of the tubular member, adog movably mounted in the mandrel and adapted to engage said shoulderwhen said mandrel is in one position, a means to 5 yieldingly hold thedog outwardly, and a projection in the enlarged bore portion spaced fromthe shoulder and from the opposite end of the enlarged bore portion andadapted to engage and retract the dog when the mandrel is moved to bringthe dog to mid position in the enlarged bore portion, the projectionterminating in a direction away from the shoulder in an outwardlyinclined cam face.

5. 4. A liner setter and puller comprising av tubular member providedwith an enlarged bore portion defining a shoulder, a mandrel adapted toenter the bore of the tubular member, a dog movably mounted in the omandrel, a means yieldingly holding the dog outwardly so as to engagesaid shoulder, and an inward projection in the enlarged bore portion ofthe tubular lmember adapted to be brought into engagement with the dogby relative longitudinal movement between the tubular member and mandrelfor retracting said dog.

5. A liner setter and puller comprising a tubular member provided withan enlarged 9 bore portion defining a shoulder, a mandrel adapted -toenter the vbore, of the tubular member, a dog movably mounted in themandrel and adapted to engage said shoulder when said mandrel is in oneposition, a means 5 to yieldingly hold the dog outwardly, and aprojection in the enlarged bore portion spaced from the shoulder andfrom the opposite end of the enlarged bore portion and adapted to engageand retract the dog when the mandrel is moved longitudinally to bringthe dog to mid position-in the enlarged bore portion.

6. A liner setter and puller comprising a tubular member provided withan enlarged 5 bore portion defining a shoulder, a mandrel adapted toenter the bore of the tubular member, a dog movably mounted in themandrel and adapted to engage said shoulder when saidmandrel is in oneposition, a means to 0 yieldingly hold the dog outwardly, and aprojection in the enlarged bore portion spaced from the shoulder andfrom the opposite end minating downwardly in an outwardly and downwardlyslanting cam face, a mandrel adapted to enter the bore of the tubularmember, a dog movably mounted in the mandrel, and a means yieldinglyholding the dog outwardly to engage the shoulder when the mandrel isturned to one position, the cam face engaging the dog when the mandrelis lowered and turned to a different position and then raised.

8. A linersetter and puller comprising a tubular member provided with aninternal approximately horizontal shoulder and provided with aprojection positioned to one side of said shoulder and extending belowthe level of said shoulder, said projection terminating downwardly in anoutwardly and downwardly slanting cam face, a mandrel adapted to enterthe bore of the tubular member, a dog movably mounted in the mandrel,and a means yieldingly holding the dog outwardly to engage the shoulderwhen the mandrel is turned to one position, the cam face engaging thedog'when the mandrel is lowered andfturned to a different position andthen raised, the adaptor being provided with an inwardly projectingvertically eX- tending shoulder engageable by the dog when the mandrelis lowered into a third position and turned in one direction.

9. A liner setter and puller comprising a tubular member provided withan internal. approximately horizontal shoulder and provided with aprojection positioned to one side of said shoulder and extending belowthe level of said shoulder, said projection terminating downwardly in anoutwardly and downwardly slanting cani face, a mandrel adapted to enterthe bore of the tubular member, a crescentshaped dog pivoted at one endin the mandrel to swing horizontally, and a spring in the mandrelyieldingly thrusting the dog outward so that said dog will engagebeneath the shoulder when the mandrel is turned to one position, the camface engaging the dog when the mandrel is lowered and turned in adifferent position and then raised.

Signed at Bakersfield, Calif., this 25 day of February 1929. v

, BYRON F. BLACKMARR.

of the enlarged bore portion and adapted t0,\

engage and retract the dog when the mandrel is moved longitudinally tobring the dog` to mid position in the enlarged bore portion, theprojection terminating in a direction away from the shoulder in anoutwardly inclinedcam face.

o 7. A liner setter and puller comprising a. tubular member providedwith an internal approximately horizontal shoulder and prov1( ed with aprojection positioned to one side of said shoulder and extending belowthe level of said shoulder, said projection terlul ian

